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Implemented responder retransmission, currently enabled for quick mode only

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This commit is contained in:
Martin Willi
2012-03-20 17:31:30 +01:00
parent dc8e964775
commit f5a84055fe
2 changed files with 121 additions and 61 deletions
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src/libcharon/sa/ike_sa_manager.c
+1 -1
View File
@@ -1071,7 +1071,7 @@ METHOD(ike_sa_manager_t, checkout_by_message, ike_sa_t*,
if (message->get_request(message) &&
message->get_message_id(message) == entry->message_id)
{
DBG1(DBG_MGR, "ignoring request with ID %d, already processing",
DBG1(DBG_MGR, "ignoring request with ID %u, already processing",
entry->message_id);
}
else if (wait_for_entry(this, entry, segment))
src/libcharon/sa/ikev1/task_manager_v1.c
+120 -60
View File
@@ -42,6 +42,14 @@
*/
#define MAX_OLD_HASHES 2
/**
* First sequence number of responding packets.
*
* To distinguish retransmission jobs for initiating and responding packets,
* we split up the sequence counter and use the upper half for responding.
*/
#define RESPONDING_SEQ INT_MAX
typedef struct exchange_t exchange_t;
/**
@@ -86,6 +94,11 @@ struct private_task_manager_t {
* Exchange we are currently handling as responder
*/
struct {
/**
* Message ID of the last response
*/
u_int32_t mid;
/**
* Hash of a previously received message
*/
@@ -96,6 +109,16 @@ struct private_task_manager_t {
*/
packet_t *packet;
/**
* Sequence number of the last sent message
*/
u_int32_t seqnr;
/**
* how many times we have retransmitted so far
*/
u_int retransmitted;
} responding;
/**
@@ -228,46 +251,63 @@ static bool activate_task(private_task_manager_t *this, task_type_t type)
return found;
}
METHOD(task_manager_t, retransmit, status_t,
private_task_manager_t *this, u_int32_t message_seqnr)
/**
* Retransmit a packet, either as initiator or as responder
*/
static status_t retransmit_packet(private_task_manager_t *this, u_int32_t seqnr,
u_int mid, u_int retransmitted, packet_t *packet)
{
/* this.initiating packet used as marker for received response */
if (message_seqnr == this->initiating.seqnr && this->initiating.packet )
u_int32_t t;
if (retransmitted > this->retransmit_tries)
{
u_int32_t timeout;
packet_t *packet;
job_t *job;
if (this->initiating.retransmitted <= this->retransmit_tries)
DBG1(DBG_IKE, "giving up after %u retransmits", retransmitted - 1);
if (this->ike_sa->get_state(this->ike_sa) != IKE_CONNECTING)
{
timeout = (u_int32_t)(this->retransmit_timeout * 1000.0 *
pow(this->retransmit_base, this->initiating.retransmitted));
charon->bus->ike_updown(charon->bus, this->ike_sa, FALSE);
}
else
{
DBG1(DBG_IKE, "giving up after %d retransmits",
this->initiating.retransmitted - 1);
if (this->ike_sa->get_state(this->ike_sa) != IKE_CONNECTING)
{
charon->bus->ike_updown(charon->bus, this->ike_sa, FALSE);
}
return DESTROY_ME;
}
if (this->initiating.retransmitted)
{
DBG1(DBG_IKE, "retransmit %d of request with message ID %u seqnr (%d)",
this->initiating.retransmitted, this->initiating.mid, message_seqnr);
}
packet = this->initiating.packet->clone(this->initiating.packet);
charon->sender->send(charon->sender, packet);
this->initiating.retransmitted++;
job = (job_t*)retransmit_job_create(this->initiating.seqnr,
this->ike_sa->get_id(this->ike_sa));
lib->scheduler->schedule_job_ms(lib->scheduler, job, timeout);
return DESTROY_ME;
}
return SUCCESS;
t = (u_int32_t)(this->retransmit_timeout * 1000.0 *
pow(this->retransmit_base, retransmitted));
if (retransmitted)
{
DBG1(DBG_IKE, "sending retransmit %u of %s message ID %u, seq %u",
retransmitted, seqnr < RESPONDING_SEQ ? "request" : "response",
mid, seqnr < RESPONDING_SEQ ? seqnr : seqnr - RESPONDING_SEQ);
}
charon->sender->send(charon->sender, packet->clone(packet));
lib->scheduler->schedule_job_ms(lib->scheduler, (job_t*)
retransmit_job_create(seqnr, this->ike_sa->get_id(this->ike_sa)), t);
return NEED_MORE;
}
METHOD(task_manager_t, retransmit, status_t,
private_task_manager_t *this, u_int32_t seqnr)
{
status_t status = SUCCESS;
if (seqnr == this->initiating.seqnr && this->initiating.packet)
{
status = retransmit_packet(this, seqnr, this->initiating.mid,
this->initiating.retransmitted, this->initiating.packet);
if (status == NEED_MORE)
{
this->initiating.retransmitted++;
status = SUCCESS;
}
}
if (seqnr == this->responding.seqnr && this->responding.packet)
{
status = retransmit_packet(this, seqnr, this->responding.mid,
this->responding.retransmitted, this->responding.packet);
if (status == NEED_MORE)
{
this->responding.retransmitted++;
status = SUCCESS;
}
}
return status;
}
METHOD(task_manager_t, initiate, status_t,
@@ -461,8 +501,8 @@ METHOD(task_manager_t, initiate, status_t,
message->destroy(message);
return initiate(this);
}
this->initiating.seqnr++;
DESTROY_IF(this->initiating.packet);
status = this->ike_sa->generate_message(this->ike_sa, message,
&this->initiating.packet);
if (status != SUCCESS)
@@ -474,16 +514,25 @@ METHOD(task_manager_t, initiate, status_t,
charon->bus->ike_updown(charon->bus, this->ike_sa, FALSE);
return DESTROY_ME;
}
message->destroy(message);
this->initiating.seqnr++;
if (expect_response)
{
message->destroy(message);
return retransmit(this, this->initiating.seqnr);
}
charon->sender->send(charon->sender,
this->initiating.packet->clone(this->initiating.packet));
this->initiating.packet->destroy(this->initiating.packet);
this->initiating.packet = NULL;
if (message->get_exchange_type(message) == QUICK_MODE)
{ /* keep the packet for retransmission in quick mode. The responder
* might request a retransmission */
charon->sender->send(charon->sender,
this->initiating.packet->clone(this->initiating.packet));
}
else
{
charon->sender->send(charon->sender, this->initiating.packet);
this->initiating.packet = NULL;
}
message->destroy(message);
if (exchange == INFORMATIONAL_V1)
{
@@ -502,14 +551,6 @@ METHOD(task_manager_t, initiate, status_t,
return initiate(this);
}
/**
* handle exchange collisions
*/
static bool handle_collisions(private_task_manager_t *this, task_t *task)
{
return FALSE;
}
/**
* build a response depending on the "passive" task list
*/
@@ -519,7 +560,7 @@ static status_t build_response(private_task_manager_t *this, message_t *request)
task_t *task;
message_t *message;
host_t *me, *other;
bool delete = FALSE, flushed = FALSE;
bool delete = FALSE, flushed = FALSE, expect_request = FALSE;
status_t status;
me = request->get_destination(request);
@@ -533,6 +574,10 @@ static status_t build_response(private_task_manager_t *this, message_t *request)
message->set_message_id(message, request->get_message_id(request));
message->set_request(message, FALSE);
this->responding.mid = request->get_message_id(request);
this->responding.retransmitted = 0;
this->responding.seqnr++;
enumerator = this->passive_tasks->create_enumerator(this->passive_tasks);
while (enumerator->enumerate(enumerator, (void*)&task))
{
@@ -541,17 +586,14 @@ static status_t build_response(private_task_manager_t *this, message_t *request)
case SUCCESS:
/* task completed, remove it */
this->passive_tasks->remove_at(this->passive_tasks, enumerator);
if (!handle_collisions(this, task))
{
task->destroy(task);
}
task->destroy(task);
continue;
case NEED_MORE:
/* processed, but task needs another exchange */
if (handle_collisions(this, task))
{
this->passive_tasks->remove_at(this->passive_tasks,
enumerator);
if (task->get_type(task) == TASK_QUICK_MODE)
{ /* we rely on initiator retransmission, except for
* three-message exchanges */
expect_request = TRUE;
}
continue;
case ALREADY_DONE:
@@ -587,8 +629,12 @@ static status_t build_response(private_task_manager_t *this, message_t *request)
return DESTROY_ME;
}
if (expect_request && !delete)
{
return retransmit(this, this->responding.seqnr);
}
charon->sender->send(charon->sender,
this->responding.packet->clone(this->responding.packet));
this->responding.packet->clone(this->responding.packet));
if (delete)
{
return DESTROY_ME;
@@ -895,6 +941,16 @@ METHOD(task_manager_t, process_message, status_t,
{
if (this->initiating.old_hashes[i] == hash)
{
if (this->initiating.packet &&
i == (this->initiating.old_hash_pos % MAX_OLD_HASHES) &&
msg->get_exchange_type(msg) == QUICK_MODE)
{
DBG1(DBG_IKE, "received retransmit of response with ID %u, "
"resending last request", mid);
charon->sender->send(charon->sender,
this->initiating.packet->clone(this->initiating.packet));
return SUCCESS;
}
DBG1(DBG_IKE, "received retransmit of response with ID %u, "
"but next request already sent", mid);
return SUCCESS;
@@ -921,7 +977,7 @@ METHOD(task_manager_t, process_message, status_t,
flush(this);
return DESTROY_ME;
}
this->initiating.old_hashes[(this->initiating.old_hash_pos++) %
this->initiating.old_hashes[(++this->initiating.old_hash_pos) %
MAX_OLD_HASHES] = hash;
}
else
@@ -975,6 +1031,7 @@ METHOD(task_manager_t, process_message, status_t,
ike_sa_id_t *ike_sa_id;
ike_cfg_t *ike_cfg;
job_t *job;
ike_cfg = charon->backends->get_ike_cfg(charon->backends, me, other);
if (ike_cfg == NULL)
{
@@ -1160,6 +1217,8 @@ METHOD(task_manager_t, reset, void,
DESTROY_IF(this->responding.packet);
DESTROY_IF(this->initiating.packet);
this->responding.packet = NULL;
this->responding.seqnr = RESPONDING_SEQ;
this->responding.retransmitted = 0;
this->initiating.packet = NULL;
this->initiating.mid = 0;
this->initiating.seqnr = 0;
@@ -1248,6 +1307,7 @@ task_manager_v1_t *task_manager_v1_create(ike_sa_t *ike_sa)
},
.ike_sa = ike_sa,
.initiating.type = EXCHANGE_TYPE_UNDEFINED,
.responding.seqnr = RESPONDING_SEQ,
.rng = lib->crypto->create_rng(lib->crypto, RNG_WEAK),
.queued_tasks = linked_list_create(),
.active_tasks = linked_list_create(),